#include<bits/stdc++.h>
using namespace std;
using Int = long long;

struct Precision{
  Precision(){
    cout<<fixed<<setprecision(12);
  }
}precision_beet;

//INSERT ABOVE HERE
signed main(){
  Int m,n;
  cin>>m>>n;
  double a=m;
  for(Int i=0;i<n;i++) a=(a*2)/3+(a+1)/3+0/3;
  cout<<a<<endl;
  return 0;
}